Vat dye.



' of sulfuric acid anthraquinone mercaptans STATES PATENT OFFICE.

PAUL THOMASCH-E'WSKLOF VOHWINKEL, NEA B. ELZBEBFEIi D, GERMANY, ASSIGNOR TO FABBENFABRI'KEN VOBM. FBIEDB. BAYER &-CO., 01 ELBERFELD, GERMANY, A

.CORPORATION OF, GERMANY.

No Drawing.-'

Specification)! Letters Intent.

Application filed February 28, 1911. Serial 1T0. 811,861.

VAT DYE.

; Ifatented Dec. 5, 1911.

near Elberfield, Germany, have invented new and useful Improvements Vat Dye, of which the following isfa specification.

My invention relates to, the manufacture and production of new vat dyestufis of the anthraquinone series. Theprocess for their production consists. in condensing by means s with oxyanthraquinones.

46 from an. alkaline hydrosulfite vat brown does ,nolonger increase. luted with 600; parts of water, the dye is The new dyes are after being dried and pulverized reddish to brown powders soluble in' concentrated sulfuric acid generally with from a greento greenish-blue coloration; dyeing cotton from. an alkaline hydrosulfite vat from red to oran to brown shades and possess probably e following general formula:

60 parts ofa 98 per cent. sulfuric acid un til the melt has assumed a n.co1oration and the quantity of the estufi formeda melt 18' die filtered ed and boiled with dilute caustic which the ure product isonly soluble with difliculty.

colorationand in concentrated sulfuric acid with a green coloration. It dyes cotton shades, yellowish-red by rinsing and t red-brown needles soluble 'inboilingfnaphthale'ne with an oran e soaping. formula Other inercaptans can be used e; 9. an-

thraquinone 1.5 dimercaptanine aminoanthraquinone-l-mercaptan, ant ,aquinone-2- 'mercaptan, etc., and other oxyanthraquinones e. g. anthrarufin, 2-0xyanthraquinone,

ing probably the following general formula:

inwhich A ant-hraquinone radical,

owders soluble in concentrated sulfuric aci generally with from a green to greenish-blue coloration;

dyeing cotton from an alkalinehydrosulfite vat from. orange-to red to brown shades.

substantially as described.

2. The herein described mat dye having probably the formula:

Thedye has most probably the which dyes are after' being dried and pul- .verized reddish to brown boiling quinolin red brown needies sollible my hand hi the preence of two subscribing in boiling naphthalen with an orange (:01- wltness's. oration; being soluble in concentrated sulfuric acid with a green coloration, and'dye- THOMABOHEWSKI' 5 ing cotton from a hydresulfite vat ellow- Witnesses; H

red shades, substantiallv :iigfde'scri l OHAB, J. -Wmen'r, In tetimony whereof I have h'ereuntoset ALFRED HENKEL.

Copies of thfii pgtght may be obtained to! fl v e dents each, by addressing the commune: or Iatents.

- a wa ahington, D. 0. 

